Glad to hear Topaz Labs is helping out with some free software!
I find that a setting of [Lines-100-100] gives me the best results for most images from a Theta Z1, but each image will react slightly differently to the application of the AI algorithm. Some images will require different settings to mitigate artifacts that occur from complicated geometry or subtle color or light variation.
Gigapixel can be used after stitching. This yields the best results in my opinion and doesn’t create stitch lines or seams.
Happy editing!